<status value="active"/> <date value="2014-03-26"/> <description value="Video media type."/> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-mediaType"/> <filter> <property value="concept"/> <op value="descendent-of"/> <value value="video"/> </filter> </include> </compose> </ValueSet>

Include codes from http://terminology.hl7.org/CodeSystem/v3-mediaType where concept descends from video

<status value="active"/> <date value="2014-03-26"/> <description value="Video media type."/> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-mediaType"/> <filter> <property value="concept"/> <op value="descendent-of"/> <value value="video"/> </filter> </include> </compose> </ValueSet>